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对克拉其亚(Clarkria)湖相层中新世沉积物的某个层位的孢粉研究表明,沉积物中普遍存在的黑白交替的薄层理是一种季节性沉积的纹泥,黑色层理是夏秋沉积物,白色层理是冬春沉积物。利用立体显微镜从岩石中采集样品能够成功地把0.1mm左右的纹泥层理分离开。
Pollen studies on a layer of Miocene sediments in the Lacustrine Lake lacustrine facies show that the alternating black-and-white laminae in the sediments are a seasonal sediment, black layers Reason is the summer and autumn sediment, white bedding is winter and spring sediments. Using stereomicroscopes to collect samples from the rock successfully separates the grain boundaries of about 0.1 mm.